Changed version to 1.8.5-trunk

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@3355 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/version.mak b/version.mak
index 4fcf201..2c81b16 100644
--- a/version.mak
+++ b/version.mak
@@ -1 +1 @@
-export PJ_VERSION := 1.8.5
+export PJ_VERSION := 1.8.5-trunk